Security advisory

{
  "id": "b07b590663ebfa93cd9105e8c401e3ec7ee9570b3ef33a3c51710d659c01c334",
  "url": "https://osv.dev/vulnerability/CVE-2026-7664",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-7664",
    "summary": "IBM Langflow OSS 1.0.0 through 1.8.4 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.",
    "evidence": "osv:CVE-2026-7664",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-7664",
      "aliases": [
        "CVE-2026-7664"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/langflow-ai/langflow",
              "type": "GIT",
              "events": [
                {
                  "introduced": "24d9e86885b877ea3e9d03cbc50b963765489721"
                },
                {
                  "last_affected": "6cb87cca4c868cad096fc14139e73157740b7419"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "last_affected": "1.8.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-7664.json"
          }
        }
      ],
      "modified": "2026-10-27T02:31:03.701592442Z",
      "provider": "osv",
      "references": [
        "https://www.ibm.com/support/pages/node/7277243"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2026-7664",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460078,
  "published_at": "2026-06-22T16:16:41.88+00:00"
}